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We offer the following Services:

• AC & DC Motor Repair and Rewinding
• Servo Motor Repair
• Squirrel Cage Rotor Rebuilding
• Synchronous Motor Repair & Rewinding
• Explosion-proof Motor Repair & UL Relisting
• Generator & Exciter Repair
• On-Site Motor Efficiency Testing
• Insulation Testing (Surge, Hipot, Polarization Index)
• Lamination Restacking, Replacement, & Refurbishment
• Shaft Repair, Straightening, & Replacement
• Bearing Journal and Housing Repair
• Core Loss (Watts Loss) Testing - Stator, Rotor, & Armature
• Dynomometer Testing
• Dynamic Balancing
• Pump Repair - Split Case & Submersible
• Power Quality Monitoring
• Belzona Coatings
• Vibration Analysis
• Laser Shaft Alignment
• Oil Wear Particle Analysis
• Infrared Thermography
• Blast Cleaning - Glass Bead & Mineral Aggregate
• Extruder Screw Reclamation
• Welding - MIG, TIG, & Stick, Copper, Steel & Aluminum
• Renewal Parts & Special Item Purchasing Services
• VPI - Vacuum Pressure Impregnation
• Trickle Resin Impregnation

 

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Servo Motor Repairs:
Darby Electric Company has the expertise & equipment to evaluate, repair and test run most models. We offer a one-year warranty on repair and materials. We also have the capability of load testing both AC and DC servo motors.
Darby Electric stocks a vast variety of commonly used bearings and seals. We have dedicated electronic test equipment for testing, analyzing and documenting data. This is vital for servo repair, not only for troubleshooting but also for the electronic setup prior to installation. Mitchell feedback diagnostic allows us to have the means to accurately test feedback devices. We also have means to surge test stator, armature and some control devices by the use of bakersurge test.

Core Loss Testing
All AC stators and rotors, and all armatures are tested prior to and after stripping to ensure the integrity of the laminations before winding. Full documentation is made of "as found" and "as repaired" conditions.

Dynamometer Testing
A 300 HP 1800 RPM Regenerative Dynamometer is used to fully load test DC motors up to 300 HP and to partially load test larger DC motors. Our data acquisition software captures all of the parameters at one instant in time.

 

Dynamic Balancing - download PDF brochure here
Unbalance in the rotating assembly affects the forces imposed on the bearings, increases motor losses and decreases the motor efficiency. Unbalance is caused by the unequal distribution of weight about the rotating centerline. Unbalance is the major cause of motor vibration. Darby Electric has two Schenck balance stands (H4, 2500 # and H5, 10,000#) and one IRD stand (B200, 25,000#). There are two Schenck microprocessors in use with the three stands. Darby Electric has a Schenck VP30 and VP41 portable balancer
to use in the field.

VPI (Vacuum Pressure Impregnation)
Utilizing a 9-foot Imprex VPI system, with Dolphs CC 1118 LV Epoxy Resin, Darby Electric is able to document resin saturation of processed equipment. This process, in conjunction with a calibrated oven monitoring system, results in an excellent solution for your rewind needs!